From what I've read I'd expect
that free software is a subset of open source software (i.e. not all open
source software is free in the sense that it protects our freedoms).
That looks like a common misunderstanding, based on confusing "free"
with "copyleft". A license is a free software license if it respects
the four freedoms. Copyleft licenses go further and defend the four
freedoms. However, there are non-copyleft free software licenses,
including the original BSD license, the revised BSD license, and the
X11 license. See http://www.gnu.org/licenses/license-list.html for
more info.
Free software and open source are the names of two philosophical
camps. The free software camp is concerned about freedom; the open
source camp says it is not important. By choosing the term "free software"
we direct attention towards issues of freedom. That is very important.
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